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205 lines
7.1 KiB
C++
205 lines
7.1 KiB
C++
#ifndef RBIMPL_METHOD_H /*-*-C++-*-vi:se ft=cpp:*/
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#define RBIMPL_METHOD_H
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/**
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* @file
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* @author Ruby developers <ruby-core@ruby-lang.org>
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* @copyright This file is a part of the programming language Ruby.
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* Permission is hereby granted, to either redistribute and/or
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* modify this file, provided that the conditions mentioned in the
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* file COPYING are met. Consult the file for details.
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* @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are
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* implementation details. Don't take them as canon. They could
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* rapidly appear then vanish. The name (path) of this header file
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* is also an implementation detail. Do not expect it to persist
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* at the place it is now. Developers are free to move it anywhere
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* anytime at will.
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* @note To ruby-core: remember that this header can be possibly
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* recursively included from extension libraries written in C++.
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* Do not expect for instance `__VA_ARGS__` is always available.
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* We assume C99 for ruby itself but we don't assume languages of
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* extension libraries. They could be written in C++98.
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* @brief Creation and modification of Ruby methods.
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*/
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#include "ruby/internal/attr/nonnull.h"
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#include "ruby/internal/dllexport.h"
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#include "ruby/internal/value.h"
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#include "ruby/backward/2/stdarg.h"
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/**
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* @defgroup defmethod Defining methods
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*
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* There are some APIs to define a method from C.
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* These API takes a C function as a method body.
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*
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* ### Method body functions
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*
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* Method body functions must return a VALUE and
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* can be one of the following form:
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*
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* #### Fixed number of parameters
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*
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* This form is a normal C function, excepting it takes
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* a receiver object as the first argument.
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*
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* ```CXX
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* static VALUE my_method(VALUE self, VALUE x, VALUE y);
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* ```
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*
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* #### argc and argv style
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*
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* This form takes three parameters: argc, argv and self.
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* self is the receiver. argc is the number of arguments.
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* argv is a pointer to an array of the arguments.
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*
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* ```CXX
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* static VALUE my_method(int argc, VALUE *argv, VALUE self);
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* ```
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*
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* #### Ruby array style
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*
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* This form takes two parameters: self and args.
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* self is the receiver. args is an Array object which
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* contains the arguments.
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*
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* ```CXX
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* static VALUE my_method(VALUE self, VALUE args);
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* ```
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*
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* ### Number of parameters
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*
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* Method defining APIs takes the number of parameters which the
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* method will takes. This number is called argc.
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* argc can be:
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*
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* - Zero or positive number.
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* This means the method body function takes a fixed number of parameters.
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*
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* - `-1`.
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* This means the method body function is "argc and argv" style.
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*
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* - `-2`.
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* This means the method body function is "self and args" style.
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*
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* @{
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*/
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RBIMPL_SYMBOL_EXPORT_BEGIN()
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RBIMPL_ATTR_NONNULL(())
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/**
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* Defines a method.
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*
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* @param[out] klass A module or a class.
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* @param[in] mid Name of the function.
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* @param[in] func The method body.
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* @param[in] arity The number of parameters. See @ref defmethod.
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* @note There are in fact 18 different prototypes for func.
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* @see ::ruby::backward::cxxanyargs::define_method::rb_define_method
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*/
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void rb_define_method(VALUE klass, const char *mid, VALUE (*func)(ANYARGS), int arity);
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RBIMPL_ATTR_NONNULL(())
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/**
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* Defines a module function for a module.
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*
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* @param[out] klass A module or a class.
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* @param[in] mid Name of the function.
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* @param[in] func The method body.
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* @param[in] arity The number of parameters. See @ref defmethod.
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* @note There are in fact 18 different prototypes for func.
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* @see ::ruby::backward::cxxanyargs::define_method::rb_define_module_function
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*/
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void rb_define_module_function(VALUE klass, const char *mid, VALUE (*func)(ANYARGS), int arity);
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RBIMPL_ATTR_NONNULL(())
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/**
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* Defines a global function.
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*
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* @param[in] mid Name of the function.
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* @param[in] func The method body.
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* @param[in] arity The number of parameters. See @ref defmethod.
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* @note There are in fact 18 different prototypes for func.
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* @see ::ruby::backward::cxxanyargs::define_method::rb_define_global_function
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*/
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void rb_define_global_function(const char *mid, VALUE (*func)(ANYARGS), int arity);
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RBIMPL_ATTR_NONNULL(())
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/**
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* Defines an undef of a method. -- What?
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*
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* In ruby, there are two separate concepts called "undef" and "remove_method".
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* The thing you imagine when you "un-define" a method is remove_method. This
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* one on the other hand is masking of a previous method definition. Suppose
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* for instance:
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*
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* ```ruby
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* class Foo
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* def foo
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* end
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* end
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*
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* class Bar < Foo
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* def bar
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* foo
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* end
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* end
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*
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* class Baz < Foo
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* undef foo # <--- (*1)
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* end
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* ```
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*
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* This `undef foo` at `(*1)` must not eliminate `Foo#foo`, because that method
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* is also used from `Bar#bar`. So instead of physically executing the target
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* method, `undef` inserts a special filtering entry to the class (`Baz` this
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* case). That entry, when called, acts as if there were no methods at all.
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* But the original can still be accessible, via ways like `Bar#bar` above.
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*
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* @param[out] klass The class to insert an undef.
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* @param[in] name Name of the undef.
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* @exception rb_eTypeError `klass` is a non-module.
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* @exception rb_eFrozenError `klass` is frozen.
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* @see rb_remove_method
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*/
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void rb_undef_method(VALUE klass, const char *name);
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RBIMPL_ATTR_NONNULL(())
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/**
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* Defines an alias of a method.
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*
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* @param[in,out] klass The class which the original method belongs
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* to; this is also where the new method will
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* belong to.
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* @param[in] dst A new name for the method.
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* @param[in] src The original name of the method.
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* @exception rb_eTypeError `klass` is a non-module.
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* @exception rb_eFrozenError `klass` is frozen.
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* @exception rb_eNameError There is no such method named as `src` in
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* `klass`.
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*
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* @internal
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*
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* Above description is in fact a bit inaccurate because it ignores
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* Refinements.
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*/
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void rb_define_alias(VALUE klass, const char *dst, const char *src);
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RBIMPL_ATTR_NONNULL(())
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/**
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* Defines public accessor method(s) for an attribute.
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*
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* @param[out] klass The class which the attribute will belong to.
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* @param[in] name Name of the attribute.
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* @param[in] read Whether to define a getter method.
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* @param[in] write Whether to define a setter method.
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* @exception rb_eTypeError `klass` is a non-module.
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* @exception rb_eFrozenError `klass` is frozen.
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* @exception rb_eNameError `name` invalid as an attr e.g. an operator.
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*/
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void rb_define_attr(VALUE klass, const char *name, int read, int write);
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/** @} */
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RBIMPL_SYMBOL_EXPORT_END()
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#endif /* RBIMPL_METHOD_H */
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